style: Remove an extra comma

Fix a syntax error.

Fixes a part of Librem5/libhandy#228
11 jobs for wip/exalm/typo in 14 minutes and 59 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #254130
librem5
api-visibility

00:02:48

passed #254132
librem5
build-debian-clang

00:04:06

passed #254131
librem5
build-debian-gcc

00:03:04

passed #254133
librem5
build-fedora-gcc

00:04:03

 
  Test+Docs
passed #254134
librem5
build-gtkdoc

00:02:25

passed #254135
librem5
unit-test

00:02:21

42.3%
 
  Package
passed #254136
librem5
package-debian-buster

00:02:27

passed #254137
librem5:arm64
package-debian-buster:arm64

00:06:00

failed #254138
flatpak allowed to fail
package-flatpak

00:00:09

 
  Test Package
passed #254139
librem5
autopkgtest-debian-buster-package

00:02:26

passed #254140
librem5
lintian-debian-buster-package

00:00:56

 
Name Stage Failure
failed
package-flatpak Package There has been a runner system failure, please try again
Running with gitlab-runner 12.6.0 (ac8e767a)
on arm01-runner 53gNDtDb
ERROR: Preparation failed: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (executor_docker.go:982:0s)
Will be retried in 3s ...
ERROR: Preparation failed: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (executor_docker.go:982:0s)
Will be retried in 3s ...
ERROR: Preparation failed: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (executor_docker.go:982:0s)
Will be retried in 3s ...
ERROR: Job failed (system failure): Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? (executor_docker.go:982:0s)